DS2 is just coming up to 6 months, and have been co sleeping up until now. It's been going fine, and he would normally have a longish sleep from 7-11 then feed every 2-3 hours in the night. Frequent feeding doesn't bother me as I feed lying down at night.
Unfortunately, I started back on night shifts a couple of months ago, and have had problems since, first he was allergic to the top up formula DH gave him when we ran out of expressed milk and we've had trouble getting him back on the bottle (been signed off work), but have finally had a breakthrough with the MAM bottles.
Only thing is, I don't think its fair on DS2 (or on DH, who would have to deal with it) that he had to cope without the comfort of bf and sleeping alone when he wasn't used to it, so think i need to get him used to sleeping in his cot 
Started last night, and managed from 7 till first feed at 10, then second at 12.20 in his cot, then after that he was grizzly and upset everytime I tried to put him back in the cot, and I gave up at about 3am and just let him sleep with me. DS1 is in the next room and we have very thin walls, so I'm wary of too much noise. I don't really want to do controlled crying, but will if I have to, as he will be more distressed when I'm back on night shifts if I don't get it sorted now. Any help would be gratefully received, I am preparing for a week of shit sleep and could use some tips!